Add LaunchWorkingDir to wixstdba to facilitate processes that require a different working folder

[WIXBUG:3750](http://wixtoolset.org/issues/3750/)
Separate pull request created for wix4
Got it!

I'll push an updated verbiage as soon as I get back to the machine it's on.

Sent from my Windows Phone
________________________________
From: Bob Arnson<mailto:notifications@github.com>
Sent: ‎11/‎27/‎2014 3:31 PM
To: wixtoolset/wix3<mailto:wix3@noreply.github.com>
Cc: BMurri<mailto:blairlmurri@msn.com>
Subject: Re: [wix3] Add LaunchWorkingDir to wixstdba to facilitate processes that require a different working folder (#159)

> @@ -94,6 +94,15 @@
>                      </xs:documentation>
>                  </xs:annotation>
>              </xs:attribute>
> +            <xs:attribute name="LaunchWorkingFolder" type="xs:string">
> +                <xs:annotation>
> +                    <xs:documentation>
> +                        When used without the LaunchTargetElevatedId attribute, WixStdBA will use this working folder when launching the specified application.

My point was that the doc describes what this attribute doesn't do, not what it does do. Something like

>WixStdBA will use this working folder when launching the application specified by the LaunchTarget attribute. (Specifying a working folder for LaunchTargetElevatedId is not supported.)

If that's what happens.

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